docs: Add info about mipmaps in WebGLRenderTarget docs

WebGLRenderTargets sets generateMipmaps to false for the related texture, which differs from the default behaviour of the Texture object, where generateMipmaps is true by default:

https://github.com/mrdoob/three.js/blob/master/src/renderers/WebGLRenderTarget.js#L35

https://github.com/mrdoob/three.js/blob/master/src/textures/Texture.js#L53

Should we add that to WebGLRenderTarget list of options or at least as a side note?

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